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VM: Add ASM_MUL for x86.

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* libguile/vm-i-scheme.c (ASM_MUL): New macro.
  (mul): Use ASM_MUL if available.
This commit is contained in:
Mark H Weaver 2013-08-03 15:05:59 -04:00
parent 9f6211707b
commit 4fa65b903b
1 changed files with 27 additions and 3 deletions
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30
libguile/vm-i-scheme.c
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@ -287,6 +287,26 @@ VM_DEFINE_FUNCTION (149, ge, "ge?", 2)
slow_sub: \
do { } while (0)
# define ASM_MUL(x, y) \
{ \
scm_t_signed_bits xx = SCM_I_INUM (x); \
asm volatile goto ("mov %1, %%"_CX"; " \
"test %[tag], %%cl; je %l[slow_mul]; " \
"sub %[tag], %%"_CX"; " \
"test %[tag], %0; je %l[slow_mul]; " \
"imul %2, %%"_CX"; jo %l[slow_mul]; " \
"add %[tag], %%"_CX"; " \
"mov %%"_CX", (%[vsp])\n" \
: /* no outputs */ \
: "r" (x), "r" (y), "r" (xx), \
[vsp] "r" (sp), [tag] "i" (scm_tc2_int) \
: _CX, "memory", "cc" \
: slow_mul); \
NEXT; \
} \
slow_mul: \
do { } while (0)
#endif
@ -356,16 +376,20 @@ VM_DEFINE_FUNCTION (153, sub1, "sub1", 1)
RETURN (scm_difference (x, SCM_I_MAKINUM (1)));
}
# undef ASM_ADD
# undef ASM_SUB
VM_DEFINE_FUNCTION (154, mul, "mul", 2)
{
ARGS2 (x, y);
#ifdef ASM_MUL
ASM_MUL (x, y);
#endif
SYNC_REGISTER ();
RETURN (scm_product (x, y));
}
# undef ASM_ADD
# undef ASM_SUB
# undef ASM_MUL
VM_DEFINE_FUNCTION (155, div, "div", 2)
{
ARGS2 (x, y);